Fedora EPEL 6 update for tor

Published: 2018-03-08 | Updated: 2025-04-24

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-0490 CVE-2018-0491
CWE-ID	CWE-476 CWE-416
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #2 is available.
Vulnerable software	Fedora Operating systems & Components / Operating system tor Operating systems & Components / Operating system package or component
Vendor	Fedoraproject

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU12293

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-0490

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the directory-authority protocol-list subprotocol implementation due to NULL pointer dereference. A remote attacker can cause the service to crash via a misformatted relay descriptor that is mishandled during voting.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 6.0

tor: before 0.2.9.15-1.el6

CPE2.3

External links

https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-4bcfff2d5e

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Use-after-free

EUVDB-ID: #VU31346

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2018-0491

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes